Been using the Mobil 1 Semi Synth in the Kawa Triples for years - "touchwood" never had any problems with them.
Using the same stuff in the MZ just means that I dont have to buy 2 different oils, I tend to ride the MZ fairly hard so I like to think that the semi synth may allow me to get a few more miles out of it before it needs any major surgery.
It is quite difficult to get truth on most lubes, and as a result not easy to make a decision.
I guess that we all have our favourite lubes.